It's easy to extend this script to cater for multiple feeds, or break it up into categories if needs be. You'll also most probably want to separate the reading and writing functions too. Reading a large number of remote feeds can be time-consuming, and not viable if your page is read by multiple people.

As always there are other ways - you can use PHP's XSL functions, for example, as pointed out by Byron Adams in a response to last month's article. Or as Jens Ulrik suggested, use an existing solution, such as Magpie-RSS. Hopefully you've seen just how easy it is to do this yourself, and just how simple RSS really is. Good luck!